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I recently got a wideband to troubleshoot the lack of power that i'm having. Essentially due to fueling inconsistencies / knock. The AFR at WOT in any gear will go down to 9.8 if i let it. Needless to say, i'm staying off of it, but here is my learning view, after a week of not resetting the ECU.

At the same time, I popped open RomRaider and noticed that even at idle, I had an AF Correction #1 ranging through -3.12 - 14.84. I had done a boost leak test before and didn't find anything. Any ideas as to what could be causing this guys? I've done the starter fluid test, and couldn't notice any leaks either! I did a compression test last week, and everything was healthy.

Disregard the memorized codes - those were from a week ago. When i tried unplugging the maf / o2 sensor.

Prior to resetting the ECU, the car runs and has the same exact issues, less the codes. I've taken multiple learning view screenshots, and they're all nearly identical (maybe .1 off lol).

What could cause these conditions? My tuner can't do anything because he lives out in another state, and can't seem to track it down through the internet. He charges for e-mails so I can't just keep throwing money at him for it. There aren't any reputable shops in this area, either, aside from the dealership.

Prior to resetting the ECU, the car runs and has the same exact issues, less the codes. I've taken multiple learning view screenshots, and they're all nearly identical (maybe .1 off lol).

What could cause these conditions? My tuner can't do anything because he lives out in another state, and can't seem to track it down through the internet. He charges for e-mails so I can't just keep throwing money at him for it. There aren't any reputable shops in this area, either, aside from the dealership.

The LV at idle indicates a leak, but trims aren't terrible anywhere else. Boost dropping below 10 indicates what is most likely a mechanical issue. It's possible Scott messed up the ROM in some way, but not likely.

It does very much have the symptoms of a post-turbo leak... it's small under vac, which only really affects idle trims dramatically. Under boost it's larger, affecting AFR.

He probably started charging because he realized you want help troubleshooting what he has determined is a mechanical issue.

Was your boost leak test after you had these symptoms? What psi did you pressurize to? and what did you use to attempt to detect the leak?

The LV at idle indicates a leak, but trims aren't terrible anywhere else. Boost dropping below 10 indicates what is most likely a mechanical issue. It's possible Scott messed up the ROM in some way, but not likely.

It does very much have the symptoms of a post-turbo leak... it's small under vac, which only really affects idle trims dramatically. Under boost it's larger, affecting AFR.

He probably started charging because he realized you want help troubleshooting what he has determined is a mechanical issue.

Was your boost leak test after you had these symptoms? What psi did you pressurize to? and what did you use to attempt to detect the leak?

Hmm - so that could be the TGV or Intake Manifold gaskets, since I already tested out the Intercooler and TB coupler, right? Replaced the Y-pipe gaskets ahead of time. I've had it smoke tested, and pressure tested to 20 PSI.

The pressure test was also after the symptoms occurred, and I used soapy water for that test.

Ok I cleaned the maf, put a new pcv valve in, and put a new clamp on the y pipe to turbo. Idle seems a bit better, but it still hits like 10.4 at wot. Also, it feels like there isn't any additional power between 70% throttle and 100%.

Ok guys - I installed a new o2 sensor and it's still having the issue. The car idles almost perfectly when I unplug the maf sensor. So that means either I have a vac leak somewhere, or my maf sensor is bad?